package ch7;

import java.util.*;

public class kehou7 {
    public static void main (String args[ ]){
        Scanner reader=new Scanner(System.in);
        double sum=0;
        int m=0;
        while(reader.hasNextDouble()){
            double x=reader.nextDouble();
            assert x<100&&x>0:"输入的成绩非法！";
            m=m+1;
            sum=sum+x;
        }
        System.out.printf("%d个数的和为%f\n",m,sum);
        System.out.printf("%d个数的平均值是%f\n",m,sum/m);
    }
}

